import {v4 as uuidv4} from 'uuid';
//要生成一个随机字符串，且每次执行不能发生变化，游客身份持久存储
export const getUUID = ()=>{
    // 先从本地存储获取uuid
    let uuid_token = localStorage.getItem('UUIDTOKEN');
    //如果没有我生成
    if(!uuid_token) {
        // 生成游客临时身份
        uuid_token = uuidv4();
        localStorage.setItem("UUIDTOKEN",uuid_token);
    }
    return uuid_token;
}